/Engine/Source/Runtime/MeshConversion/Public/MeshDescriptionUVsToDynamicMesh.h
The converter prefers shared UVs when they are available, though it will populate instanced UVs as well on the way back.
class FMeshDescriptionUVsToDynamicMesh
double
ScaleFactor
The [0,1] UV range will be scaled to [0, ScaleFactor].
int32
UVLayerIndex